Results 71 to 80 of about 5,753 (177)

Advanced modelling of a moderate-resolution holographic spectrograph

open access: yes, 2017
In the present article we consider an accurate modeling of spectrograph with cascade of volume-phase holographic gratings. The proposed optical scheme allows to detect spectra in an extended wavelength range without gaps providing relatively high ...
Fabrika, Sergei   +3 more
core   +1 more source

A comprehensive radial velocity error budget for next generation Doppler spectrometers

open access: yes, 2016
We describe a detailed radial velocity error budget for the NASA-NSF Extreme Precision Doppler Spectrometer instrument concept NEID (NN-explore Exoplanet Investigations with Doppler spectroscopy).
Bender, Chad   +16 more
core   +1 more source

Echelle grating based mode demultipexer for vertical mode-division multiplexing

open access: yesOptics Express, 2016
We have proposed a mode multi/demultiplexer based on the echelle grating suitable for vertical multimode bus waveguide. Compared with the lateral multimode waveguide, the vertical scheme has much smaller bending radius which leads to compact system size.
Jun, Chen, Yang, Yang, Ning, Zhu
openaire   +2 more sources

The Pathfinder Testbed: Exploring Techniques for Achieving Precision Radial Velocities in the Near-Infrared

open access: yes, 2010
The Penn State Pathfinder is a prototype warm fiber-fed Echelle spectrograph with a Hawaii-1 NIR detector that has already demonstrated 7-10 m/s radial velocity precision on integrated sunlight.
Bender, Chad   +7 more
core   +1 more source

Electromagnetic diffraction efficiencies for plane reflection diffraction gratings [PDF]

open access: yes
Results are presented of research activities on holographic grating research. A large portion of this work was performed using rigorous vector diffraction theory, therefore, the necessary theory has been included in this report.
Marathay, A. S., Shrode, T. E.
core   +1 more source

Hubble Space Telescope: Goddard high resolution spectrograph instrument handbook. Version 2.1 [PDF]

open access: yes
The Goddard High Resolution Spectrograph (GHRS) is an ultraviolet spectrometer which has been designed to exploit the imaging and pointing capabilities of the Hubble Space Telescope.
Duncan, Douglas K., Ebbets, Dennis
core   +1 more source

High Resolution HST-STIS Spectra of CI and CO in the Beta Pictoris Circumstellar Disk

open access: yes, 2000
High resolution FUV echelle spectra showing absorption features arising from CI and CO gas in the Beta Pictoris circumstellar (CS) disk were obtained on 1997 December 6 and 19 using the Space Telescope Imaging Spectrograph (STIS).
A. Jolly   +15 more
core   +2 more sources

Photoelectrochemical fabrication of spectroscopic diffraction gratings, phase 2 [PDF]

open access: yes
This program was directed toward the production of Echelle diffraction gratings by a light-driven, electrochemical etching technique (photoelectrochemical etching).
Carrabba, Michael M.   +5 more
core   +1 more source

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